Can't Adjust Brightness Using F1 and F2 Keys

My MBP was having difficulties starting up today (stalling at the grey screen w/ the Apple symbol) so I ran Disk Utility to repair, and everything seemed to be fine.

But now all the pre-set function keys are working save the F1 and F2 keys. I've tried pressing the fn keys before, but I am still not able to adjust the brightness. I also tried resetting the PRAM, but that did no good either. Currently, all the other function keys are doing their pre-set commands -- I didn't change any of them. What can I do to get the F1 and F2 keys working again?

Thanks!